Window-latch.



G. ERZ.

WINDOW LATCH.

APPLICATION FILED APB..21, 1911.

1,972,593, A Patented Sept. 9, 1913.

WITNESSES IIVVE/VTOR 14 TTORIUEYS .eEo GE m r rrnnn, wasemcrpm LflTCH.

Specification of {Letters Tatent. I

Pat nted Sept-9, 1915 .mnnoamnmmr 2mms m m. maizlowing is a full, clear,and exact description. I

My invention is an improvement in winplaced at either side of the windowand which will be inconspicuous when in place.

In the drawings :-Figure 1 is a front view of the improvement, showingthe latch extended with the cover plate removed; Fig. 2 is a similarview showing the latch withdrawn; Fig. 3 is a similar view showing thelatch-partially extended; Fig. 4 is a section on the line 4-4 of Fig. 1;Fig. 5 is a face view of the escutcheon with the handle removed; Fig. 6is a similar view with the handle in place; and Fig. 7 is a section onthe line 77 of Fig. 1.

The present embodiment of the invention comprises a casing consisting ofplates 1 and 2 spaced apart by a block 3 and held together by screws 4which ass through the plates and the block. The lock is provided with acentral recess 5 and with a longitudinal passage 6 intersecting therecess and opening at one end of the block. The said end is covered by ashield plate 7 A latch 7 is slidable in the passage 6, and the uppercorner of the outer end of the latch is beveled at 8. The latch isprovided with a transverse slot 9 and with recess 10 in one side wallextending at right-angles to the slot andintersecting the same. Thelatch is normally pressed outwardly by a coil spring 11 seated in theinner end of the passage 6 and bearing against the inner end of thelatch. A' plate 12 is provided for attachment to the window caslng andthe said plate is equipped with ratchet teeth 13. The teeth face upwardso that when the window is lifted the beveled corner of the latch willengage the inclined faces 14 of the'teeth. When However the window islowered, the lower edge of, the latch engages the horizontal faces 15 ofthe teeth and hold the latch and window in adjusted position.

An operating cam 16 is arranged in the opening'lO, and the said cam isprovided with an eccentric portion 17 having one edge 18 plain and theother edge provided with ratchet :teeth "19. .That portion of the latchat each end of the opening '10 is provided with spaced notches 20 foriengagementcby the point of the .eccentric :portion of the cam to EhOld:the said latch withdrawn .or extended, A key21 is provided foroperating the cam and the cam has a central opening tor receiving the.key- The .outer lend 22 .of the key is polygonal in cross section andis ovided with a cross head 23 secured to the ey by a pin 24. The headis arched longitudinally and isarranged with its ends in contact with anescutcheon 25 circular in form and having openings 26 for receivingscrews or nails to hold it in place. The

escutcheon is also provided with a central openin 27 for the key andwith indications or gui es in the form of legends 28. The said guidesindicate the positions to be assumed by the head to hold the latch open,closed, or in the position of Fig. 3. The head is provided at one endwith a point 29 acting as an indicator, and at the other end with a claw30 to distinguish the said end from the end 29. The cam may be turned bythe key and when so turned will extend or withdraw the latch bar and thesaid bar may be locked in either position by engaging the point with anotch.

The curved edge 18 of the cam 16 is adapted to engage the rear wallofthe recess 10 in the latch 7 to retract the latch and to put the spring11 under compression. If desired, the point of the cam may be engaged inthe teeth which, are formed in the rear wall of the recess 10, to holdthe latch releasably in a retracted position. Likewise, the point of thecam may be engaged in the teeth which are formed in the forward wall ofthe recess 10 in the latch 7, to prevent rearward movement of the latchbeyond a predetermined point represented by the extremity of the cam. Attimes, the point of the cam cannot be engaged in the notches -which areformed in the forward wall of the recess 10 in the latch 7, because theplate is formed on the forward wall of the recess- 10in the latch.

I claim:-' In a device of the class described, a casing; alatch mountedin the casing for right line movement, the latch having a recess andthere being teeth formed in the latch in the forward and rear walls ofthe recess; spring means for advancing the latch; a shaft journaled inthe vcasing; and a cam secured ,to the shaft, the cam being movable inthe recess, the camhaving a curved surface adapted to engage the rearwall of the recess, to retract the latch against the action of thespring means, the cam having a point adapted to en age detachably in theteeth of the rear wa to hold the latch retracted, and to engage theteeth of the forward wall detachably, thereby to prevent rearwardmovement of the latch; thecam having teeth in one ofits edges, adaptedto cooperate detachabl with the lowermost tooth of the for-war wall toprevent a retraction of the latch when the same cannot be advancedsufficiently to to lcloiiperate wlth the teeth of the forward wa 1 Intestimony whereof I have signed my name to this specification in thepresence of a two subscribing witnesses.

GEORGE- ERZ.

Witnesses:

D. L. Bnoxnfl, H. E. Smam'.

ermit the point of the cam 20

